144hz Monitors Suggestions

Good day, Redditors!

My build is a i5-4690k + GTX 770 (1060 6Gb soon next year) computer, I've been on the hunt for a new monitor because I want to enjoy 144hz's glory.

Current setup

Just some 60hz 1080p Hp Pavilion.

Price reference

I'm in the UK and thinking of getting a monitor some time during the black Friday and/or cyber Monday. So I would appreciate suggestions up to £300 because I'm counting on the price reductions.

Purchasing Help Template

Budget: Preferred ~£300 (400$)

Prospective Resolution (3840x2160, etc.): 1920x1080/1920x1200

Size (27 inches, etc.): 24 inches

Aspect Ratio (16:9, etc.): 16:9 or 16:10

Adaptive Sync (GSync, FreeSync, or None): No special preference I guess.

Other Features (list other relevant features here):

(Optional) Usage Type (gaming, art, etc.): Gaming: FPS like CS:GO or RainbowSix is what I play the most at the moment.

Thanks in advance.